Question

The average salary of workers of a factory is rs. 150. The average salary of 12 officers is rs. 250. The average salary of the rest is rs. 120. Then, the total number of workers in the factory is?

Answer 1

Number of worker=52

Let the no of worker =X. Sum of total salary=150x. Sum of salary of 12 o officers=250×12=3000. According to last line. 150x-3000/x-12=120. 150x-3000=120x-1440. X=52